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https://issues.apache.org/jira/browse/LUCENE-5121?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13713044#comment-13713044
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Robert Muir commented on LUCENE-5121:
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We only provide back compat for the default codec.
> 4.4 RC0 can not read indexes created with 4.2.1 using Disk based docvals
> ------------------------------------------------------------------------
>
> Key: LUCENE-5121
> URL: https://issues.apache.org/jira/browse/LUCENE-5121
> Project: Lucene - Core
> Issue Type: Bug
> Reporter: Hoss Man
> Priority: Blocker
> Fix For: 4.4
>
>
> On the #solr irc channel, user adityab reported a problem trying to upgrade
> an existing solr instance from 4.2.1 to the 4.4 RC0 code. The specific error
> he reported was a "CorruptIndexException: invalid type: 65" from
> DiskDocValuesProducer.readFields using an MMapIndexInput. While waiting for
> more details from adityab on reproducible configs, i attempted to do a
> trivial test using simple solr configs based on the docvals test configs, and
> was able to trigger a slightly different error in which
> DiskDocValuesProducer.readFields caused an EOFException.
> The problem reproduces on both solr init, and when using CheckIndex --
> details to reproduce to follow in an attachment/comment
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